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don't!!
I have vectors and even set up correctly they under read incrementally higher the more power you put through them vs. a watt bike, i'm pulling together proper data but at up to 200 its about 1% or less, then up to 300 it grows to about 5% and over 300 it gets up to 10% out, so they are probably ok for weekend warriors and indeed most club rides I avg about 200 or so, but for TT'ing I think the inaccuracy is too great!
Sainsburys_Ed-
Interesting. I'll try and stick them on a bike with a Powertap and see how they compare for me. It'll involve syncing two power files, which will be a massive PITA, but such is life. From my trip to Mallorca the power readings from the Vectors seemed pretty consistent with what I'd expect them to be, although I'm not sure my self-assessed power estimate is accurate to 10%. Definitely not at over 300W.
Brommers
I was considering a Powertap P1S (left only version)- easy enough to swap between my two bikes (Shimano 105 and Rotor 3d+ cranks) and also take on holiday for hire bikes, and in theory I could buy the right pedal at a later date.
Until I saw the price - £700 for left only vs £949 for both l/r
The crazy pricing for the P1S rules that out, and I'm not sure I want to drop £949 on a power meter for the dual l/r at the moment.
Anything else I should be considering ? Garmin Vectors are better with pricing - £472 for left only vs £854 for l/r (and the upgrade kit for right at £412). However these tend to get a bad rep don't they ?